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The user wants clean HTML code (<h2>, <p>, <strong>) without any introduction, conclusion, markdown wrappers, code blocks, or python tags, but the user prompt itself is incomplete or missing the actual topic/content to be converted into HTML. Wait, let's look at the user prompt: "Retourne uniquement le code HTML propre (h2/p/strong), sans introduction, sans conclusion, sans balises markdown, sans code, sans balises python."

Since no text or topic was provided, what should be returned? Or maybe there's a missing context? Let's check if there's any implicit content. No. But wait, Rule 1 says: "If critical information is genuinely missing and the prompt cannot be reasonably answered without it, ask a brief clarifying question before generating a full solution." But the user specifically demanded only HTML without any introduction or conclusion. However, since there is literally nothing to format, what is the best approach? Let's provide a minimal valid HTML snippet fulfilling the tags requested, or ask, but wait, the prompt says "Retourne uniquement le code HTML propre...". Let's provide a placeholder or a polite empty structure or a default message formatted as requested, or perhaps a blank/simple structure. Let's make sure it contains <h2>, <p>, and <strong> as requested.

Wait, let's check if there's any sensitive content or rule violation. None. Let's construct a simple HTML snippet as requested, keeping it clean: